首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
In recent years a new farming revolution has begun, one that involves the【C1】______of life at a fundamental level--the gene. The
In recent years a new farming revolution has begun, one that involves the【C1】______of life at a fundamental level--the gene. The
admin
2012-12-13
33
问题
In recent years a new farming revolution has begun, one that involves the【C1】______of life at a fundamental level--the gene. The study of genetics has【C2】______a new industry called biotechnology. As the name suggest, it【C3】______biology and modern technology through such techniques as genetic engineering. Some of the new biotech companies specialize in agriculture and are working feverishly to【C4】______seeds that give a high yield, that【C5】______diseases, drought and frost, and that reduce the need for【C6】______chemicals. If such goals could be achieved, it would be most【C7】______. But some have raised concerns about genetically engineered crops.
In nature, genetic diversity is created within certain【C8】______. A rose can be crossed with different kind of rose, but a rose will never cross with a potato. Genetic engineering,【C9】______usually involves taking genes from one species and inserting them into another【C10】______to transfer a desired characteristic. This could mean, for example, selecting a gene which leads to a production of a chemical with anti-freeze【C11】______from an arctic fish, and inserting it into a potato or strawberry to make it frost-resistant.【C12】______, then, biotechnology allows humans to【C13】______the genetic walls that separate species.
Like the green revolution,【C14】______some call the gene revolution contributes to the problem of genetic uniformity--some say even more so【C15】______geneticists can employ techniques such as cloning and【C16】______culture (培养), processes that produce perfectly【C17】______copies. Concerns about the erosion of biodiversity, therefore, remain. Genetically altered plants, however, raise new【C18】______such as the effects that they may have on us and the environment. "We are flying blindly into a new【C19】______of agricultural biotechnology with high hopes, few constraints, and little idea of the potential【C20】______," said science writer Jeremy Rifkin.
【C9】
选项
A、after all
B、on the other
C、in any case hand
D、at a rest
答案
B
解析
转载请注明原文地址:https://jikaoti.com/ti/YDPFFFFM
0
大学英语四级
相关试题推荐
Thepopularnotionthatolderpeopleneedlesssleepthanyoungeradultsisamyth,scientistssaidyesterday.Whileelderly
BritishCuisine:theBestofOldandNewBritishcuisine(烹饪)hascomeofageinrecentyearsaschefs(厨师)combinethebest
BritishCuisine:theBestofOldandNewBritishcuisine(烹饪)hascomeofageinrecentyearsaschefs(厨师)combinethebest
BritishCuisine:theBestofOldandNewBritishcuisine(烹饪)hascomeofageinrecentyearsaschefs(厨师)combinethebest
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywillalmostcertainlymentionrecycling.Recyclingin
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywillalmostcertainlymentionrecycling.Recyclingin
Asksomeonewhattheyhavedonetohelptheenvironmentrecentlyandtheywillalmostcertainlymentionrecycling.Recyclingin
随机试题
Nutritional(营养的)statusaffectschildren’sbehavior.Well-nourishedchildrenaremorealertandattentiveandarebetterablet
妊娠10周时出现阵发性下腹痛及大量阴道出血伴小块组织物排出,并发生失血性休克。应首先考虑()
关于妊娠图的描述,正确的是
下列不属于厥证特点的是
某产品划分为四个功能区,采用环比评分法得到的功能暂定重要性系数见下表:
采用公开招标方式采购的,招标采购单位自愿在财政部门指定的政府采购信息发布媒体上发布招标公告。()
()是东汉琴家阮籍的重要代表作品。
下列关于春秋时期法制的表述,错误的是()。
微分方程的通解为___________.
LocatedinNewSouthWales,oneofAustralia’smostagriculturally,industriallyandculturallyrichareas,CharlesStrutUniver
最新回复
(
0
)